Novel HVDC spacers by adaptively controlling surface charges – part ii: experiment

Charge accumulation on the surface of high voltage direct current (HVDC) spacers decreases their surface flashover voltage and affects the reliability of the insulation systems. In part I of this study, a novel HVDC spacer in which the surface charges can be adaptively controlled is proposed, and th...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2018-08, Vol.25 (4), p.1248-1258
Main Authors: Chuanyang Li, Chuanjie Lin, Yong Yang, Bo Zhang, Weidong Liu, Qi Li, Jun Hu, Shun He, Xulei Liu, Jinliang He
Format: Article
Language:English
Subjects:
Adaptive control
Bias
Charge reversal
Component reliability
Conductors
Direct current
Electric potential
Electric power transmission
Energy transmission
epoxy resins
Flashover
Gas insulation
High voltages
HVDC GIL
HVDC transmission
Insulation
insulators
nonlinear material
Polarity
Spacers
Surface charge
Surface flashover
Surface treatment
Voltage measurement
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Summary:Charge accumulation on the surface of high voltage direct current (HVDC) spacers decreases their surface flashover voltage and affects the reliability of the insulation systems. In part I of this study, a novel HVDC spacer in which the surface charges can be adaptively controlled is proposed, and the aim of this paper is to experimentally verify the design. The experimental results of three kinds of model spacers, including a regular spacer, a spacer with a novel shape, and a spacer with charge adaptively controlled are provided. AC and DC surface flashover experiments and a polarity reversal test were performed. The effect of surface charges on triggering the surface flashover phenomenon are discussed. The results show that the surface flashover voltage increases both for the novel shaped spacer and the charge-adaptivelycontrolled spacer under application of AC bias, owing to a modification of the spacer shape that increases the creep distance. However, the surface breakdown voltage is the lowest for the novel shaped spacer under DC application and polarity reversal test. The charge adaptive control spacer displayed more advantages than the other samples under application of DC bias and in polarity reversal tests owing to its superior surface charge dissipation properties. It is hoped that this work could offer a new perspective for the design of a suitable spacer to avoid surface flashover when implementing HVDC energy transmission systems.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2018.007056